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The effect of temperature elevation and feeding on the pancreas of Rana esculenta in late winter

A biochemical and ultrastructural study

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Summary

Hibernating frogs (Rana esculenta) in late winter were subjected to a higher environmental temperature. In addition the animals were fed. Electronmicroscopical and biochemical methods were used to follow the changes in the pancreas under these circumstances.

The frog pancreas in winter is characterized by a very low protein synthesizing capacity, while the Golgi system is an extremely compact structure, composed of a mass of small vesicles.

A rise in the environmental temperature does not initiate protein synthesis. However, zymogen granules appear and the Golgi system becomes more differentiated.

Under these conditions protein synthesis is not started until a few hours after feeding. This is not accompanied by striking structural changes.

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Authors and Affiliations

  1. Laboratory for Histology, Medical Faculty, State University, Utrecht

    C. Poort

  2. Centre for Medical Electronmicroscopy, State University, Utrecht

    J. J. Geuze

Authors
  1. C. Poort
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  2. J. J. Geuze
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Poort, C., Geuze, J.J. The effect of temperature elevation and feeding on the pancreas of Rana esculenta in late winter. Z. Zellforsch. 98, 1–8 (1969). https://doi.org/10.1007/BF00344503

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  • DOI: https://doi.org/10.1007/BF00344503

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